Statistics! Find the minimum sample size

A researcher wishes to estimate, with 90% confidence, the proportion of people who own a home computer. A previous study shows that 40% of those interviewed had a computer at home. The researcher wishes to be accurate within .02 of the true proportion. Find the minimum sample size necessary.

In a poll taken in March 2007, Gallup asked 1006 adults whether they were baseball fans and 362 adults said they were. Construct a 95% confidence interval for the true proportion of adults that are baseball fans.

Jun 3rd, 2015

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